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三、用作條件狀語

不定式用作條件狀語也有兩個可能的位置，一是在句首，二是在句末。如：

You would make a great mistake to accept his offer. 你要是接受他的建議，你就犯了大錯誤。

To look at him you’d never think he was a successful businessman. 若看他的外貌，誰也想不到他是個事業有成的商人。

To hear her talk, you’d think she was made of money. 聽她談話的口氣，你會覺得她渾身都是錢。

這類不定式通常可用if從句來改寫。如：

To order a vehicle, you have to pay a deposit.= If you want to order a vehicle, you have to pay a deposit. 要想訂購一輛汽車，你必須交付押金。

To get into university you have to pass a number of examinations.=If you want to get into university you have to pass a number of examinations. 如果你想上大學，就必須通過一系列考試。

To join the club you have to be put up by an existing member.= If you want to join the club you have to be put up by an existing member. 要想加入俱樂部必須有一位會員做介紹人。

四、用作原因狀語

不定式用作原因狀語的情形主要用于某些“be+形容詞+不定式”結構。如：

He was glad to be home again. 他又回到家里，感到很高興。

We’re proud to be young people of China. 作為中國青年我們感到自豪。

She wept to see him in such a terrible state. 她看到他這種可怕的樣子就哭了。

五、用作方式狀語

不定式用作方式狀語的情形比較少見，主要用于as if to do sth這類結構。如：

He opened his mouth as if to say something. 他張開嘴，好像要說什么

She lifts his hand as if to lead him somewhere. 她牽起他的手，像要把他帶到某個地方去。

Smiling pleasantly, the stranger turned as if to speak to me. 那個陌生人面帶愉悅的笑容，轉身向我，似乎想對我說話。

Steve opened his mouth as if to speak, but stopped talking even before he had started. 史蒂夫張開口仿佛要說話，但是還沒有說出口又停住了。

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